Telegraph-transmitter.



PATENTED SEPT. 3 1907.

J. A. CARTER, JR. TELEGRAPH TRANSMITTER.

.APPLICATION FILED MAR. 4. 1907.

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PATENTED SEPT, 3, 1907.

J. A. CARTER, JR.- TELEGRAPH TRANSMITTER. APPLICATION FILED MAR. 4.1907.

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BATENT OFFICE.

JOSIAH A. CARTER, JR, OF ATLANTA, GEORGIA.

TE LE GRAPH-TRANSMITTER.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed March 1907. $erial No. 360,328.

To all whom it may concern.

Be it known that I, JOSIAH A. CARTER, Jr., a citizen of the UnitedStates, residing at Atlanta, in the county of Fulton and State ofGeorgia, have invented a certain new and useful Improvement inTlelegraph-Transmitters, of which the following is a full, clear, andexact description, reference being had to the accompanying drawings.

Many forms of vibrator are .in use, but in illustration of the generalprinciple 1 have adopted the device having the nature of a pendulum,which by the engagement of the key is normally held at such point in itspath of swing that when released by the withdrawal of the key it will befree to vibrate. This vibrator is utilized to make and break a circuitand send dots over the line, the number sent in succession beingdetermined by the length of time the key is held out of engagement withthe pendulum.

My device is a modification of this pendulum in length, by which a widervibratory arc is secured, and by the application of another device whichremoves the stop from the path of the vibrator automatically, permittingthe vibrator to have the full force of the stroke, and insuring afarther travel of the dots with added clearness.

The Morse key requires of the operator a separate movement of his handfor each dot and dash. The dots preponderate very greatly and mechanismhas been devised, whose principal object has been the relief of theoperator from the nervous strain consequent upon the dual attention andthe dual manual movement required by the alphabet.

The more essential features of telegraphic transmis- I sion, thecarrying of the dots farther and more clearly,

have been underestimated, and the object of my invention is not only toaccomplish the relief of the operator from strain, but also to provide alonger vibratory contact and a consequent air gap by which the dots willbe carried farther and more clearly, and also to provide a more certainregulation of the exactness of speed by which split dots or completefailure of transmission may be avoided.

To this end the mechanism consists of a lengthened vibrator, with screwweights adapted not only to change the speed of the transmission, but toregain exactly any former rate of speed, and a key lever operating torelease the vibrator, modified by an auxiliary key lever which gives thevibrator the full force of the stroke, and carries a special device forstopping the vibration automatically.

The more particular embodiment of the invention herein shown and morefully hereinafter described is also comprised within the presentinvention.

In the drawings Figure 1 is a plan view of my improved telegraphictransmitter .made in diagrammatic form; Fig. 2 is a side view of theauxiliary key lever or bar; Fig. 3 is a side view of the auxiliary keylever or bar, the key lever and the vibrator; Fig. 4 is a sectional viewof the screw weights on the end of the vibrator.

Similar figures refer to similar parts throughout the several views.

The vibrator 12'is of the usual form, except that instead of a slidableweight on its end next to the key lever 18 a series of screw weights,2323 are provided which may be taken off and replaced at the pleasure ofthe operator. These screw weights 2323 change the time of the vibrationand hence the speed of the instrument; the more the slower, the less thefaster as is well known; the screw weights 2323, however, beforereplaced se'rt'att'm bring the speed to exactly what it was when eachweight was removed. When sliding weights are used it is a difficultmatter'to replace them in their original position, and unless they areso replaced the resulting transmission would result in either completefailure or a series of split dots. The rear end of the vibrator 12 isfitted into a shoulder 6 by means of the set screw 8, and the shoulder 6is screwed to the frame 1 by means of an ordinary screw 7. This shoulder6 is so shaped as to have two arms, the lower being flat upon the frame1 and the other project ing upwards and provided witha screw hole at itspoint, so that the set screw 8 may pass through the end of the vibrator12 down into a socket on the upper side of its lower arm.

In the curve of the shoulder 6 is a jaw 10 which is provided with ascrew hole in which the screw 9 operates on the spring 11 which holdsthe vibrator 12 in place in the usual way.

Another shoulder 13, U shaped, is fastened to the frame 1, and isprovided with screws 15, 16 which adjust the movement of the vibrator12; the screw 16 on the left side of the vibrator 12 in the shoulder 13is the contact point from which the current passes into the vibrator 12.The set screw 30 is attached to the frame 1 and operates as a base orpivot to which the rear end of the key lever 18 is attached.

The auxiliary key lever or bar 17 is fixed to the frame 1 by means ofthe pivot 19 screwed to the frame and fastened by a nut on the underside. The rear end of this bar 17 is bent upward and kept permanently incontact with the vibrator 12 at the point 14. The Y front of this leveror bar 17 is so shaped as to have two arms, one 21 being a prolongationof the lever or bar itself, and through which at its point a screw 22 isplaced; this screw is always in contact with the key lever 18 exceptwhen that lever is pushed by the operator to the dash or left hand sideof the machine. The other arm 20 projects upward and is at right anglesto the lever or bar 17 and at stated intervals comes in contact with thevibrator 12 and stops it. When the key lever 18 is thrown to the dot orright hand of the machine, the auxiliary key lever or bar 17 throws thevibrator 12 into motion and at the same time removes the arm or stop 20away from the vibrator 12, thus giving the vibrator the full force ofthe stroke. In other machines the stop 20 is stationary, immovably fixedto the frame and because of its iixedness destroys fully one half of thestroke of the vibrator 12. The lever or bar 17 coupled with its arm orstop 20, together with the extreme length of the vibrator 12 resultingfrom the introduction of the lever or bar 17, permits a movement overthe contact points more than twice as far as any known key, thus givinga longer electric contact and a wider air gap, making the dots gofarther and much more clearly, and also throwing the vibrator 12 intomotion, removing the arm or stop 20, and giving the vibrator the fullforce of the stroke of the key lever 18.

The contact spring 27 on the left hand side of the vibrator 12 adjuststhe strength of the contact on the dot side and is regulated by theadjustable screw head 5 at the top of a fixed pivot 4 screwed to theframe 1. The adjustable screw 26 is for dash contact and adjusting theplay of the key lever 18 on the dash side of the machine. The spring 24holds the contact point on the dash side of the machine apart, itsstrength being adjusted by the nut on screw 25.

Point 2 and 3 are the ordinary binding posts or the wire cord which isconnected with the ordinary telegraph key by means of a plug; 28 is theusual switch for closing the circuit when the key is not in use. 29 isthe contact point for 28, completing the circuit when the switch isopen, and with all its parts is the switch used on the ordinarytelegraph key.

What I claim as my invention and desire to secure by Letters Patentis- 1. The combination of a key lever, a vibrator, and auxiliary leveror bar pivoted at its center and in constant contact at its rear endwith the vibrator and carrying in its forward end a screw adapted tocontact with the key lever, and a stop which upon release of the keylever engages the vibrator and stops it, the key lever being adapted tocontrol the operation of said auxiliary lever or bar.

2. In a telegraphic-transmitter, in combination, a vibrator extendingbeyond the pivotal point of the key lever, speed adjusting screwweights, an auxiliary lever or bar contacting with the vibrator and withthe key lever, a movable stop, and a key lever controlling the action ofthe vibrator, stop and bar.

JOSIAH A. CARTER, JR.

Witnesses 'lnos. A. PiNsoN, Gno. M. CHAIIN.

